Application takes lot of time for first time..

Hai guys,
we made an application on a 3rd party software for use on a tool which connects to SAP with RFC.
the applicaiton updates ORACLE databse after getting relevant information from SAP.
Now,for information on SAP side we have RFC.
for updates on oracle we write SQL.
the unique problem is..this applicaiton takes lot of time when used the first time..
once the first use is over it takes much lesser time for any subsequent use(by any user)..
I DOUBT THE SQLS(ESP UPDATE) TAKE MUCH TIME THE FIRST TIME.

I DOUBT THE SQLS(ESP UPDATE) TAKE MUCH TIME THE FIRST TIME.
Why don't you trace the call and be sure? Don't guess.
once the first use is over it takes much lesser time for any subsequent use(by any user)..
Because the statement is in the cursor cache - clear the cache each time and the statement will run long every time. Again, trace the call and determine the issue - most likely you need an index or have an improperly coded SELECT statement.

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Regards
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Hi oracle gurus
this querry takes lot of time ..pls suggest me
oracle version -Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
os version red hat enterprise linux ES release 4
Select * from (SELECT M.MAIL_ID, MAIL_FROM, M.SUBJECT AS S1, CEIL(M.MAIL_SIZE) AS MAIL_SIZE,
TO_CHAR(MAIL_DATE,'dd Mon yyyy hh:mi:ss am') AS MAIL_DATE1, M.ATTACHMENT_FLAG, M.MAIL_TYPE_ID,
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read_datetime, Folder_Id,compose_type,interc_count,history_id,
pined_flag, rank() over (order by mail_date desc) as rnk from v$mail M WHERE M.USER_ID=6 AND M.FOLDER_ID =1)
where rnk between 1 and 10
Elapsed: 00:00:04.65
Execution Plan
0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=15270 Card=14316 B
ytes=203716680)
1 0 VIEW (Cost=15270 Card=14316 Bytes=203716680)
2 1 WINDOW (SORT PUSHED RANK) (Cost=15270 Card=14316 Bytes=8
890236)
3 2 TABLE ACCESS (BY INDEX ROWID) OF 'MAIL' (TABLE) (Cost=
13386 Card=14316 Bytes=8890236)
4 3 INDEX (RANGE SCAN) OF 'INDX_MAIL_ALL1' (INDEX) (Cost
=57 Card=14316)
Statistics
0 recursive calls
0 db block gets
0 consistent gets
0 physical reads
0 redo size
0 bytes sent via SQL*Net to client
0 bytes received via SQL*Net from client
0 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
10 rows processed
thanks n regard

Hi Tuning gurus
i tuned the query as below ------
this querry works fine for lesser number of rows
eg :--
where ROWNUM <= 10 )
where rnum >=1;
but takes lot of time as we increase rownum ..
eg :--
where ROWNUM <= 10000 )
where rnum >=9990;
results are posted below
pls suggest me
oracle version -Oracle Database 10g Enterprise Edition
Release 10.2.0.1.0 - Prod
os version red hat enterprise linux ES release 4
also statistics differ when we use table
and its views
results of view v$mail
[select * from
( select a.*, ROWNUM rnum from
( SELECT M.MAIL_ID, MAIL_FROM, M.SUBJECT
AS S1,CEIL(M.MAIL_SIZE) AS MAIL_SIZE,
TO_CHAR(MAIL_DATE,'dd Mon yyyy hh:mi:ss
am') AS MAIL_DATE1, M.ATTACHMENT_FLAG,
M.MAIL_TYPE_ID, M.PRIORITY_NO, M.TEXT,
COALESCE(M.MAIL_STATUS_VALUE,0),
0 as email_address,LOWER(M.MAIL_to) as
Mail_to, M.Cc, M.MAIL_DATE AS MAIL_DATE,
lower(subject) as subject,read_ipaddress,
read_datetime,Folder_Id,compose_type,
interc_count,history_id,pined_flag,
rank() over (order by mail_date desc)
as rnk from v$mail M WHERE M.USER_ID=6 AND M.FOLDER_ID =1) a
where ROWNUM <= 10000 )
where rnum >=9990;]
result :
11 rows selected.
Elapsed: 00:00:03.84
Execution Plan
0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=14735 Card=10000 B
ytes=142430000)
1 0 VIEW (Cost=14735 Card=10000 Bytes=142430000)
2 1 COUNT (STOPKEY)
3 2 VIEW (Cost=14735 Card=14844 Bytes=211230120)
4 3 WINDOW (SORT) (Cost=14735 Card=14844 Bytes=9114216)
5 4 TABLE ACCESS (BY INDEX ROWID) OF 'MAIL' (TABLE) (C
ost=12805 Card=14844 Bytes=9114216)
6 5 INDEX (RANGE SCAN) OF 'FOLDER_USERID' (INDEX) (C
ost=43 Card=14844)
Statistics
294 recursive calls
0 db block gets
8715 consistent gets
8669 physical reads
0 redo size
7060 bytes sent via SQL*Net to client
504 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
6 sorts (memory)
0 sorts (disk)
11 rows processed
SQL> select count(*) from v$mail;
Elapsed: 00:00:00.17
Execution Plan
0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=494 Card=1)
1 0 SORT (AGGREGATE)
2 1 INDEX (FAST FULL SCAN) OF 'FOLDER_USERID' (INDEX) (Cost=
494 Card=804661)
Statistics
8 recursive calls
0 db block gets
2171 consistent gets
2057 physical reads
260 redo size
352 bytes sent via SQL*Net to client
504 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
results of original table mail
[select * from
( select a.*, ROWNUM rnum from
( SELECT M.MAIL_ID, MAIL_FROM, M.SUBJECT
AS S1,CEIL(M.MAIL_SIZE) AS MAIL_SIZE,
TO_CHAR(MAIL_DATE,'dd Mon yyyy hh:mi:ss
am') AS MAIL_DATE1, M.ATTACHMENT_FLAG,
M.MAIL_TYPE_ID, M.PRIORITY_NO, M.TEXT,
COALESCE(M.MAIL_STATUS_VALUE,0),
0 as email_address,LOWER(M.MAIL_to) as
Mail_to, M.Cc, M.MAIL_DATE AS MAIL_DATE,
lower(subject) as subject,read_ipaddress,
read_datetime,Folder_Id,compose_type,
interc_count,history_id,pined_flag,
rank() over (order by mail_date desc)
as rnk from mail M WHERE M.USER_ID=6 AND M.FOLDER_ID =1) a
where ROWNUM <= 10000 )
where rnum >=9990;]
result :
11 rows selected.
Elapsed: 00:00:03.21
Execution Plan
0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=14735 Card=10000 B
ytes=142430000)
1 0 VIEW (Cost=14735 Card=10000 Bytes=142430000)
2 1 COUNT (STOPKEY)
3 2 VIEW (Cost=14735 Card=14844 Bytes=211230120)
4 3 WINDOW (SORT) (Cost=14735 Card=14844 Bytes=9114216)
5 4 TABLE ACCESS (BY INDEX ROWID) OF 'MAIL' (TABLE) (C
ost=12805 Card=14844 Bytes=9114216)
6 5 INDEX (RANGE SCAN) OF 'FOLDER_USERID' (INDEX) (C
ost=43 Card=14844)
Statistics
1 recursive calls
119544 db block gets
8686 consistent gets
8648 physical reads
0 redo size
13510 bytes sent via SQL*Net to client
4084 bytes received via SQL*Net from client
41 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
11 rows processed
SQL> select count(*) from mail;
Elapsed: 00:00:00.34
Execution Plan
0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=494 Card=1)
1 0 SORT (AGGREGATE)
2 1 INDEX (FAST FULL SCAN) OF 'FOLDER_USERID' (INDEX) (Cost=
494 Card=804661)
Statistics
1 recursive calls
0 db block gets
2183 consistent gets
2062 physical reads
72 redo size
352 bytes sent via SQL*Net to client
504 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
Thanks n regards
ps : sorry i could not preserve the format plz
Message was edited by:
Cool_Jr.DBA

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